Hoist brake



H. S. MYERS.

HOIST BRAKE. APPLICATION EILED FEB-1L I922.

Patented'Apr. 18, 1922.

f gs.

T 0 all whom it may concern PATENT series.

I HARRY s. MYERS, or van, PENNSYLVANIA.

HOIST BRAKE.

. Specification of Letters Patent. am t 1 22 Application filed February 27, 1922. Serial No. 539,583.

Be it "known'that I, HARRY S. MYERs, a citizen of the United States, residingat Van, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Hoist Brakes, of which the following is a specification;

This invention relates to a hoisting'brake, and more particularly to such a brake comprising a band and track associated with a winding drum and means for causing'the band to bind or grip the track.

The invention may be embodiedinany type of machinery wherein a brake of large power is desirable, but I have selected for the purpose of illustration its use in a hoist attachment for tractors in which a drum supporting frame is mounted upon-the differential housing of a Fordson tractor.

The object of the invention is to provide a brake of the type, which is powerful in operation, easily operated and within convenient' reach of an operative of hoist machinery. A further object is the provision of operating meansffor such a brake which occupies a minimum of space. and operates with a minimum of friction. A still further object of the invention is the efficient mounting and spacing ofan eccentric upon a shaft so that the parts will not bind upon each other in operation. Other objects and advantages of the invention will hereinafter appear in the following description and the novel features thereof will be particularly pointed out in the appended claims. I

Like reference numerals indicate like parts throughout-the several figures of the drawings, in which- Figure 1 is a sectional view through a hoist attachment for a tractor showing the parts of my improved brake and operating means in side elevation,

Figure 2 is a rear elevation of one corner of said hosting attachment showing my improved brake operating means, Figure 3 is a sectional view of the operating means taken upon the line 3-3 of of my invention may be embodied in various forms and that the special embodiment thereon shown and described in this instrument ismerely indicative of those principles. Ithas, however, been found to be a practical and efficient embodiment and one which in usehas produced excellent results in the special hoisting mechanism in connection with which it has been used.

In-order that my invention may be clearly understood it is necessary to briefly outline the particular hoisting attachment in which it has been shown as used before proceeding with a detail description of the parts comprising the brake mechanism. A full and complete description of this hoisting attachment is given in mycopending applications for; patents identified as follows: Serial Number 518,980,filed November 30-, 1921. for hoistjattachmentfor tractors; Serial Number 532.992, filed, January 31, 1922, for winding drums, and Serial Number 533,956. filed February 3, 1922, for arrangement of winch elements.

The frame of the hoist attachment comprises vertical supporting members 10 adapted to be attached to the differential housing of a tractor, shown in outline in F igure 1. horizontal rails 11 and 12, to which are attached bearing carrying elements 13 suitably braced as. shown partly in dotted lines in Figure l.v The elements 13 have horizontally dispose-d portions supporting bearings 14, in which is mounted a drive shaft 15, and vertically disposed portions supporting bearings'16, in which is mounted a drum shaft 17. The drum. of the hoist is indicated by the numeral 18,- and has assooiated. withit a brake track 19 on which the band 20 rests and is held between the flanges 21 and 22. a Rising from the bearings 14 of the drive shaft are apertured ears or bearings lugs 23 and 4, in which is mounted brake operating shaft 25 projecting beyond the ears or lugs 23 and 24. Upon one end of the shaft ismounted the eccentric 26 keyed to the shaft 25, by a key 27. it being understood that the shaft iszprovided with a groove of a length to neatly receive the key while the eccentric is grooved for its entire width.

Upon the shaft and at either side of the eccentricare one or more washers 28 and 28 which have a diameter suflicient to project beyond the eccentric surface to form retaining means for the band 20.. It will be noted that these washers will maintain the eccentric upon thekey and prevent undue lateral movement of the eccentric upon the I shaft. The key has been shown in Figure 3 especially when the eccentric has a driven fit with the key. Upon the-opposite end-of the shaft 25 is mounted in any suitable manner the lever the means for attaching the hub 30 of the lever to the shaft as a set screw 31, it will be appreciated that the means so employed might take any form and embody if desirable a non-circular shaft end and'hub aperture.

In Figure 4 I have shown a modified form of shaft andleverin one piece, which has been found to be satisfactory in use. The two parts are made of round stock and bent at a sharp angle at a suitable point to provide the upstanding lever.

It will be apprecia'ted that the washer 28 and pin 32 will prevent the movement of the eccentric upon the shaft in one direction and that the washer 28 abutting the ear 23 will act as a stop for the eccentric in the opposite direction. The shaft is also prevented from undue movementlaterally'in theears 23 and 24 by these parts. As the washers may either rotate with theshaft or rotate thereon, the friction is reduced to a minimum.

For instance, when the washer28 abuts the ear 23, the band 20 under the influence of the flange 22 will lie against the washer 28, which is free to rotate with the shaft and eccentric. The only friction then would be between the end of the key 27 and the washer 28'. When the hub 30 abuts the car '24, the washers are free to rotate with the the hub and car.

The band20'is passed around the eccentric and the loop is completed in any desired manner, as by welding. I have shown a rivet or bolt 32 passing through the end and the body of the band. The opposite end of the band has welded thereto a "bolt 33 having its screw threaded end passing through the rail 12 and secured by lock nuts 34.;

It will be seen that the lever 29 in its inactive position can be readily reached and operated from a point to the rear of the tractor or from the seat *thereof. Th'eusual point-of operation of the brake is at the rear of the tractor, when the lever is thrown in the direction of the arrow in Figure 1. In'the applying of the brake, theeccentric will not only tighten the band upon the trackubutwill cause slightly more of it to come into contact with the track.

Fromthe foregoing description theo ration of the brake wil be apparent. tremai'ns only to point outthe of-spaee While I have shownoccupied by this particular construction of" parts.

In hoist attachments of this type, the available space is that which is defined by the distance between the tractive wheels. Allof the hoist elements must be placed within this width of space. It will be noted a that the eccentric and washers take onlythewidth occupied by the brake track and fia-nges, that the ears occupy the width of the drive shaft bearing, and that the hub 30 occupies only part'of'the width-ofth'e hub 35 of the drive sprocket wheel. My brake is therefore one of a few number of standard parts and occupies a minimum of space. v a

"Having described my invention, what I claim asnew and desire to secure byLetters Patent is: T

' 1, In a brake for hoist drums, a brake track, a band adapted to grip said track andhaving a looped end, a shaft, an eccentric lying in'said looped end and adapted to he slid upon the shaft and to rotate therewith, means for limiting ithemovement of the eccentric upon said shaft and for'main- 'yond the surface of said eccentric for m'aintainin'g said eccentric upon said shaft and said looped end upon said eccentric, and means for rotating said shaft and eccentric to-i-ause said band to bind said track.

3. In a hoisting machine comprising a frame element carrying drum' and brake shaft bearings, a drum shaft supporting a brake track and associated. band in close proximityto said frame element, a brake shaft having its end projecting beyond its bearing, an eccentric mounted upon the projecting'end of said brake shaft and encircled by the looped end of said band and held in alignment with said brake track, means .for rotating'said brake shaft and eccentric to cause a binding of the band to the track 4. In a brake for hoisting drums, a brake track, aband adapted to grip said track and "having a looped end a shaft, an eccentric ly' ing within said looped end and keyed tosaid shaft, the key being slightly longer than groove in said shaft of a length to receive the same, washers rotatably mounted upon "the width of said eccentric and lying in a g said shaft at each side of said-eccentric and 5. In a hoisting attachment for tractors centric and loop retaining means of a width comprising a framework, bearings upon the not in excess of said brake track and means frame for drive and driven shafts, a drum for maintaining said eccentric in alignment 10 and associated brake track and band, a brake with said brake track.

5 operator comprising a shaft mounted in In testimony whereof I aflix my signature.

bearing means of a width not in excess of the bearing for said drive shaft, and an ec- HARRY S. MYERS. 

